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KMID : 0043319910140030237
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Archives of Pharmacal Research
1991 Volume.14 No. 3 p.237 ~ p.241
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A Study of Azo-Hydrazone Tautomedsm in 3-Phenyi4-arylazo-5-isozaolones by 1H-NMR Spectra of 15N-Labeled Compounds and HMO Method
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Shawali AS
Alkaabi SS/Abdallah MA
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Abstract
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The tautomerism in 3-phenyl-4-arylazo-5-isoxazolones 1 was examined by 1H-NMR spectra of 15N-labeled compound and by HMO method. Both spectra data (1 H-NMR and IR) and bonding energies are in support of the assignment of the hydrazone structure to such compounds. It is further shown that intermolecular and intramolecular hydrogen bondings favor the hydrazone tautomer.
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